. The feeding of animals. Feeds. 116 THE FEEDING OF ANIMALS and finally enters one of the main blood vessels. Any material, therefore taken up by the lacteals ultimately reaches the blood. The capillaries all converge to a larger blood vessel, known as the portal vein, which enters the liver, transferring to that organ whatever material the capillaries iave absorbed. 170. Manner of food absorption.—^The manner in which the soluble food is absorbed has been explained in part on common physical grounds. ^Vhen two solutions of different densi- /C3r;iV4K%A ^'^^' containing diffusible compounds, /
. The feeding of animals. Feeds. 116 THE FEEDING OF ANIMALS and finally enters one of the main blood vessels. Any material, therefore taken up by the lacteals ultimately reaches the blood. The capillaries all converge to a larger blood vessel, known as the portal vein, which enters the liver, transferring to that organ whatever material the capillaries iave absorbed. 170. Manner of food absorption.—^The manner in which the soluble food is absorbed has been explained in part on common physical grounds. ^Vhen two solutions of different densi- /C3r;iV4K%A ^'^^' containing diffusible compounds, / mRSiW ^ separated by a permeable mem- t^|BjQn^jtl 1 rane, diffusion tJirough this membrane Irom the denser to the lighter liquid ill always occur. Such a condition i this prevails in the intestines, we ay believe. The intestinal solution, le denser one, is separated from a ss concentrated liquid, the blood, hich is constantly flowing on the i;her side of a thin dividing mem- 1 rane. Under these conditions there ;curs the passage into the blood of certain parts of the digested food. It is held that in this way water, soluble mineral salts, and sugar pass directly into the blood vessels, chiefly from the small intestine. 171. Changes in the walls of the intestinal tract.— In the absorption of peptones and fats, at least, forces are encountered other than the osmotic transference of sub- stances in solution, the operation of which is still more or less Fig. 5. Intestinal villus, _ showing: a, epithelium; b, capil- laries; c, lacteal ves- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jordan, Whitman H. (Whitman Howard), 1851-1931. New York, The Macmillan Company
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